diff --git a/rust/nci.nix b/rust/nci.nix
index 25c7dfc..79202c3 100644
--- a/rust/nci.nix
+++ b/rust/nci.nix
@@ -47,10 +47,10 @@
         # NOTE: duplicated in flake.nix devShell
         env = {
           LIBCLANG_PATH =
-            if pkgs.stdenv.cc.isClang then
-              null # don't set the variable
-            else
-              lib.makeLibraryPath [ pkgs.buildPackages.llvmPackages.clang-unwrapped ];
+            lib.makeLibraryPath [ pkgs.buildPackages.llvmPackages.clang-unwrapped ];
+          BINDGEN_EXTRA_CLANG_ARGS =
+            # Work around missing [[deprecated]] in clang
+            "-x c++ -std=c++2a";
         } // lib.optionalAttrs pkgs.stdenv.cc.isGNU {
           # Avoid cc wrapper, because we only need to add the compiler/"system" dirs
           NIX_CC_UNWRAPPED = "${pkgs.stdenv.cc.cc}/bin/gcc";
diff --git a/rust/nix-expr/src/eval_state.rs b/rust/nix-expr/src/eval_state.rs
index db7c97e..b631595 100644
--- a/rust/nix-expr/src/eval_state.rs
+++ b/rust/nix-expr/src/eval_state.rs
@@ -632,7 +632,10 @@ pub fn test_init() {
 
     // When testing in the sandbox, the default build dir would be a parent of the storeDir,
     // which causes an error. So we set a custom build dir here.
-    nix_util::settings::set("sandbox-build-dir", "/custom-build-dir-for-test").unwrap();
+    // Only available on linux
+    if cfg!(target_os = "linux") {
+        nix_util::settings::set("sandbox-build-dir", "/custom-build-dir-for-test").unwrap();
+    }
     std::env::set_var("_NIX_TEST_NO_SANDBOX", "1");
 
     // The tests run offline